Forget people! The real concern for farmers is not that humans get swine flu from pigs ... it's the other way around!

Humans have it. Pigs don't. At least not yet, and U.S. pork producers are doing everything they can to make sure that the new H1N1 virus, known around the world as the "swine flu," stays out of their herds.

"That is the biggest concern, that your herd could somehow contract this illness from an infected person," said Kansas hog farmer Ron Suther, who is banning visitors from his sow barns and requiring maintenance workers, delivery men and other strangers to report on recent travels and any illness before they step foot on his property.

"If a person is sick, we don't want you coming anywhere on the farm," Suther said.